Why did the United States enter World War II?

Accepted answers

(Bombing of) Pearl Harbor
Japanese attacked Pearl Harbor
To support the Allied Powers (England, France, and Russia)
To oppose the Axis Powers (Germany, Italy, and Japan)

Explanation

The U.S. entered WWII after Japan attacked Pearl Harbor.

The explanation is our own study note, not official wording.

Source: USCIS, 2025 version (USCIS M-1778, 09/25)Verified Jul 23, 2026Official PDF

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